摘要
归来庄金矿是近年来在鲁西南新发现的隐爆角砾岩型金矿床 ,成因上与附近铜石偏碱性杂岩体有关。本文通过对侵入杂岩和金矿床中流体包裹体研究 ,结合前人地质勘探和科研成果 ,认为形成归来庄金矿的成矿流体是岩浆水与大量来自围岩的大气降水混合而成 ,早期为富含卤素和 CO2 的低 -中等盐度热液 ,演化至晚期为低挥发分、不同盐度的低温热水溶液。金矿沉淀时的流体压力不高于 40～ 60 MPa,温度为 1 80～ 2 50℃。温度下降和伴随隐爆作用发生的减压和流体不混溶是促使金沉淀的主要因素。
The Guilaizhuang gold deposit, discovered recently in southwest Shandong province, China, is one of cryptoexplosive breccia type. The deposit occurs in the lower Paleozoic carbonate strata and is associated genetically with the Tongshi subalkaline igneous complex. Based on the fluid inclusion study of the gold deposit and of the igneous rocks and combined with the information obtained from exploration and research on the gold deposit, it is suggested that the ore fluids responsible for the Guilaizhuang gold deposit are the mixtures of magmatic water with a large quantity of meteoric water from the country rocks which were the high temperature, halogen and CO 2 rich hydrothermal solutions with low to medium salinity during the early stage and evolved to the low temperature aqueous solutions containing minor volatiles with various salinities in the later stages. During the deposition of gold the fluid pressure was no more than 40～60 MPa while the temperature from 250℃ to less than 200℃. The decrease of temperature and fluid unmixing accompanied with the cryptoexplosion are the important factors causing gold deposition.
出处
《地质科学》
CAS
CSCD
北大核心
2001年第1期1-13,T001,T002,共15页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金项目(编号:49133130,49702030)
南京大学成矿作用国家重点实验室开放基金项目联告资助
关键词
归来庄金矿
铜石杂岩体
隐爆角砾岩
流体包裹体
显微测温
The Guilaizhuang gold deposit
The Tongshi Complex
Cryptoexplosion
Fluid inclusions
Microthermometry
